iterate through map c 2b 2b

1//traditional way (long)
2for(map<string,int>::iterator it=m.begin(); it!=m.end(); ++it)
3	if(it->second)cout<<it->first<<" ";
4//easy way(short) just works with c++11 or later versions
5for(auto &x:m)
6	if(x.second)cout<<x.first<<" ";
7//condition is just an example of use
8

1map<string, int>::iterator it;
2
3for (it = symbolTable.begin(); it != symbolTable.end(); it++)
4{
5    std::cout << it->first    // string (key)
6              << ':'
7              << it->second   // string's value 
8              << std::endl;
9}
10

1#include <iostream>
2#include <map>
3 
4int main() {
5  std::map<int, float> num_map;
6  // calls a_map.begin() and a_map.end()
7  for (auto it = num_map.begin(); it != num_map.end(); ++it) {
8    std::cout << it->first << ", " << it->second << '\n';
9  }
10}

1//Since c++17
2for (auto& [key, value]: myMap) {
3    cout << key << " has value " << value << endl;
4}
5//Since c++11
6for (auto& kv : myMap) {
7    cout << kv.first << " has value " << kv.second << endl;
8}

1#include <iostream>
2#include <map>
3
4int main()
5{
6    std::map<std::string, int> myMap;
7
8    myMap["one"] = 1;
9    myMap["two"] = 2;
10    myMap["three"] = 3;
11
12    for ( const auto &myPair : myMap ) {
13        std::cout << myPair.first << "\n";
14    }
15}
16

1    for (auto i : m)
2        cout << i.first << "   " << i.second
3             << endl;